Just do what Bohefus says. the .xx to .xx is in WInRar format. Download the latest WinRar, install and then open the program. Navigate to your first .xx file, click it once to highlight it, then choose "extract to" from the buttons on top. Browse for a location, click "ok" and violaaa. Should result in an ISO file. Burn it with DVD Decrypter, Nero, etc.